Lists all the threads in the VM - Java Java Virtual Machine

Java examples for Java Virtual Machine:JVM

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Description

Lists all the threads in the VM

Demo Code

/**//from  w w w  .  j  a v a 2s . c o  m
 *  Copyright Terracotta, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
//package com.java2s;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;

public class Main {
    /**
     * Lists all the threads in the VM
     *
     * @return a List of type Thread
     */
    public static Collection<Thread> enumerateThreads() {
        // Find the root thread group
        ThreadGroup root = Thread.currentThread().getThreadGroup();
        while (root.getParent() != null) {
            root = root.getParent();
        }

        Thread[] threads;
        int threadCount;
        do {
            int activeEstimate = root.activeCount();
            threads = new Thread[activeEstimate + 1];
        } while ((threadCount = root.enumerate(threads)) >= threads.length);

        return new ArrayList<Thread>(Arrays.asList(threads).subList(0,
                threadCount));
    }
}

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